CVE-2026-4185 GPAC MP4Box swf_parse.c swf_def_bits_jpeg stack-based overflow
A stack-based buffer overflow in GPAC's MP4Box allows remote attackers to execute arbitrary code or cause denial of service via crafted SWF files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4185?
CVE-2026-4185 is a medium-severity memory corruption vulnerability in GPAC, published on 15 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was found in GPAC up to 2.5-DEV-rev2167-gcc9d617c0-master. This vulnerability affects the function swf_def_bits_jpeg of the file src/scene_manager/swf_parse.c of the component MP4Box. The manipulation of the argument szName results in stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been made public and could be used. The patch is identified as 8961c74f87ae3fe2d3352e622f7730ca96d50cf1. A patch should be applied to remediate this issue.
Which versions are affected by CVE-2026-4185?
How do I fix CVE-2026-4185?
No fix has been published for CVE-2026-4185 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-4185 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4185 exists.
Sources
Also known as DEBIAN-CVE-2026-4185, GHSA-2hwp-9jff-pr6q, UBUNTU-CVE-2026-4185.